抄録
This work concerns the study of bone regeneration between two parts of a cut bone that occurs while the
elongation of such bone. In the actuation that can move one part of the bone with respect to the other the
displacement will be discontinuous consisting of very small steps to maintain a daily given very small gap
between the two bone parts. The forces required are very weak because they only stretch the tendons that
are elongated in few displacements. The actuator described in this paper fulfils given specifications and is
of few centimetres dimensions. It is a piezoelectric actuator so that the use of magnetic resonant imagery
could be possible even if the patient wears such actuator. The principle of displacement is inchworm and
its total range is only determined by the length of the rotor (moving part). A prototype has already been
achieved. This paper deals with the design and the characterization of this actuator.
